Characteristics of mammary secretions from Holstein cows at approximately 10 days before parturition: with or without intramammary infection
Characteristics of mammary secretions from Holstein cows at approximately 10 days before parturition: with or without intramammary infection
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荷斯坦奶牛产前约 10 天乳腺分泌物的特征：有或没有乳房内感染
DOI：
10.1080/09712119.2017.1368524
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发表时间：
2017
影响因子：
1.4
通讯作者：
Hirai Tsunao
中科院分区：
文献类型：
--
作者：
Watanabe Atsushi;Hata Eiji;Slama Petr;Kimura Kazuhiro;Hirai Tsunao
为了评价干奶期后期乳房内感染与乳腺分泌基本特征之间的关系，对产犊前9-12天的20头奶牛的乳腺分泌物进行肉眼观察、感染状态、体细胞计数（SCC）、血清白蛋白浓度、免疫球蛋白（Ig）G1和IgG2水平的检测。 80 个宿舍中，有 37 个宿舍的乳腺分泌物中发现乳房内感染。所有发生乳房内感染的乳腺分泌物均表现出比正常初乳更低的粘度。在4份无乳房内感染的乳腺分泌物中，发现了一些肉眼可见的异常。对于没有乳腺内感染或宏观异常的乳腺分泌物，粘度明显高于正常初乳，表明粘度与产犊前约10天乳腺分泌物的宏观正常性相关。存在乳房内感染或肉眼可见异常的乳腺分泌物中，SCC 和血清白蛋白浓度显着升高。 SCC 和血清白蛋白浓度与乳腺分泌物的粘度相关，这表明大多数产犊前 10 天左右的乳房内感染可能会导致乳腺炎，并导致血乳屏障的通透性增加。无论是否存在乳房内感染或宏观异常，IgG1 和 IgG2 浓度均未观察到显着差异。
To evaluate the relationship between intramammary infection and basic characteristics of mammary secretion at late dry period, regarding mammary secretions, macroscopic observations, infection status, somatic cell counts (SCC), serum albumin concentrations, immunoglobulin (Ig) G1, and IgG2levels were examined on 20 dairy cows at 9–12 days before calving. Intramammary infections were found in mammary secretions from 37 of the total 80 quarters. All of the mammary secretions with intramammary infection showed lower viscosity than that of normal colostrum. In four mammary secretions without intramammary infection, some macroscopic abnormalities were found. For mammary secretions without intramammary infection or macroscopic abnormality, viscosities were apparently higher than that in normal colostrum, indicating that viscosity is associated with macroscopic normality of the mammary secretion at approximately 10 days before calving. SCC and serum albumin concentrations were significantly higher in mammary secretions with intramammary infection or macroscopic abnormality. The SCC and serum albumin concentrations were correlated with viscosity of the mammary secretions, suggesting that most intramammary infections at approximately 10 days before calving may cause mastitis with increased permeability of the blood–milk barrier. No significant difference was observed in concentrations of IgG1and IgG2, regardless of the presence of intramammary infections or macroscopic abnormalities.